Dale! Lo dije todo en ingles para no quedar raro en un mar de comentarios en "English" jajaja. Seguire en ingles mas que nada para que otros podran seguir la conversacion.
I don't want to pry too much but I imagine the pain in the butt preparations for announcing a game would be. I'm guessing it involves things like mainly preparing promo art, a basic synopsis to hook fans in and building a little bit of "hype" around it as much as possible. Maybe even doing some guest posts here and there to get some eyes heading towards your direction. I wish the best of luck with you on that! You seem to have everything under control and know what you're doing. If you're ever needing ideas on better implementation I can always try to have a stab at it.
As for a portfolio, thank you for your interest! I've done some concept art for clients in the past but since I've only done art as an on and off thing (I'm mostly studying engineering actually) I never built up a full on portfolio. I can send you 2 or 3 samples that I think you'd be most interested in but I don't want to feel like I'm spamming your game page with things that have nothing to do with OTL. I'll leave my email here just in case you ever want to message me or so I can send you the samples. Swordticus@gmail.com. I also added you on twitter :)
If you ever need anything just holler! Money isn't an issue for me and I'd love to take part even if it's just a small little thing.
Good luck man! Suerte!